Initiate a dead code elimination pass in the optimizing compiler.

Change-Id: Ie9db5d8e2c2c30e34145a0f7d2386b8ec58cfc4e
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index e2ba867..ac07721 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -140,6 +140,7 @@
   compiler/jni/jni_compiler_test.cc \
   compiler/oat_test.cc \
   compiler/optimizing/codegen_test.cc \
+  compiler/optimizing/dead_code_elimination_test.cc \
   compiler/optimizing/dominator_test.cc \
   compiler/optimizing/find_loops_test.cc \
   compiler/optimizing/graph_checker_test.cc \